Welcome!
Interesting question. I've found the determining factor to be character level versus monster level, not class level (though not true for stamina casters). For a particular mage class I've found that your major and minor skill levels (for that spell) are an additional factor (asuming we are firing off the spell at full power). This is just a general feeling, no hard anlaysis here. Others may have found differently (I'll be interested in reading other experiences on this subject.)
In otherwords you shouldn't have any problem with your switch other than the fact that your major skills (other than the mage's single major discipline) will not continue to improve.
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